guix-play/guix/build/meson-configuration.scm

;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
;;;
;;; This file is part of GNU Guix.
;;;
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;;; under the terms of the GNU General Public License as published by
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;;; your option) any later version.
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;;; GNU General Public License for more details.
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(define-module (guix build meson-configuration)
  #:use-module (ice-9 match)
  #:export (write-section-header write-assignment write-assignments))

;; Commentary:
;;
;; Utilities for generating a ‘Cross build definition file’ for
;; the Meson build system.  Configuration values are currently
;; never escaped.  In practice this is unlikely to be a problem
;; in the build environment.
;;
;; Code:

(define (write-section-header port section-name)
  "Write a section header for a section named SECTION-NAME to PORT."
  (format port "[~a]~%" section-name))

(define (write-assignment port key value)
  "Write an assignment of VALUE to KEY to PORT.

VALUE must be a string (without any special characters such as quotes),
a boolean or an integer.  Lists are currently not supported"
  (match value
    ((? string?)
     (format port "~a = '~a'~%" key value))
    ((? integer?)
     (format port "~a = ~a~%" key value))
    (#t
     (format port "~a = true~%" key))
    (#f
     (format port "~a = false~%" key))))

(define* (write-assignments port alist)
  "Write the assignments in ALIST, an association list, to PORT."
  (for-each (match-lambda
              ((key . value)
               (write-assignment port key value)))
            alist))